the question is asking this:
the correct answers are as follows, Vlimit = 0 V, Vdiode = 5 V
I don't get why it ended up like that. My intuition says that, "fails
to open" means not functioning, and so no forward current flowing in the diode, in that case, the voltage across the resistor is 10 V, the voltage across the diode is 0 V.